package book;

//书架
public class BookList {
    //书架上有很多书，可以用数组
    private Book[] books = new Book[10];
    //表示当前书架上的书的有效个数
    private int usedSize;

    /**
     * 当调用该构造方法的时候，书架上预先存放3本书
     */
    public BookList() {
        books[0] = new Book("三国演义","罗贯中",10,"小说");
        books[1] = new Book("西游记","吴承恩",15,"小说");
        books[2] = new Book("红楼梦","曹雪芹",5,"小说");
        usedSize = 3;
    }

    /**
     * 获取某一个下标的书
     * @param pos
     * @return
     */
    public Book getBook(int pos) {
        if (pos < 0) {
            return null;
        }
        return books[pos];
    }

    /**
     * 给pos位置放一本书
     * @param pos
     * @param book
     */
    public void setBook(int pos, Book book) {
        books[pos] = book;
    }

    public int getUsedSize() {
        return usedSize;
    }

    public void setUsedSize(int usedSize) {
        this.usedSize = usedSize;
    }

}
